Ok. Here's code that should be able to do it.
*But PLEASE make a backup of your work before trying this!!!! IT'S REALLY
IMPORTANT! THIS MACRO MAY CHANGE EVERY TIDDLER IN YOUR TW FILE!!*
There are several caveats here.
One is that *every eligible tiddler will have it's modification date
changed.*
Do this on a desktop, not on a tablet or small device!
Another, when you first save the tiddler with the button, there may be a
delay. You may be asked if you want to keep waiting. You need to keep
waiting.
When you finally press the button, there will be even longer delays while
it processes. You will probably be asked several times if you want to wait
for the page before the process completes. It typically took 2 to 3 "waits"
on tiddlywiki.com, and there's only 1100 tiddlers there!
I strongly recommend that you close out any tabs you don't need. In fact,
be sure all your work in all your applications is saved in case the browser
hangs the machine.
At the top of the code you can set a value for min-per-group. This is the
minimum number of tiddlers you want before creating its own group entry.
Paste the code into a tiddler and close the tiddler. Then, if you're sure
you want to, press the button.
The reason this code is so inefficient is that it is generating all 17576
possible combinations of 3 letters and checking to see if any of your
tiddlers match by title. A much more efficient code could have been written
with just a tiny bit of javascript. Oh well.
Be careful!
Have fun -- if you can!
-- Mark
\define min-per-group() 10
\define ABC() A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
\define xABC() A B C D E F
\define regexpABC() (?i)^$(letr1)$$(letr2)$$(letr3)$
\define glueABC() $(letr1)$$(letr2)$$(letr3)$
<$button> Create alphabetical TOC structure
<$list filter="[enlist<ABC>]" variable=letr1>
<$list filter="[enlist<ABC>]" variable=letr2>
<$list filter="[enlist<ABC>]" variable=letr3>
<$list filter=
"[all[tiddlers]!has[draft.of]regexp<regexpABC>rest<min-per-group>limit[1]]"
variable="dummy">
<$action-setfield $tiddler=<<glueABC>> tags=<<letr1>> />
<$list filter="[all[tiddlers]regexp<regexpABC>]" >
<$fieldmangler>
<$action-sendmessage $message="tm-remove-tag" $param=<<letr1>>/>
<$action-sendmessage $message="tm-add-tag" $param=<<glueABC>>/>
</$fieldmangler>
</$list>
</$list>
</$list>
</$list>
</$list>
</$button>
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